In order to link a bundle product with the options, all the products should be imported to Magento first.
Here are the minimum required fields to import a new product:
For more convenience, please, feel free to add product attributes such as name, price, description, etc.:
Here is an example of the import file:
Then, in another profile, the following fields will be needed:
Root Entity
Bundle Option Entity
Bundle Option Value Entity
Bundle Selection
The field catalog_product_bundle_selection.product_id field is responsible for the IDs of products you need to include in the bundle, and the catalog_product_bundle_selection.product_id field should contain the ID of the bundle product. "Sku to Product ID" modifier will be helpful in case you would not like to mention IDs in the import file. Adding the modifier allows inserting product SKU values to the import file, while the extension will automatically convert them to IDs during the import process.